MidtermMultiSeries

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<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font: 10px sans-serif;
}

svg {
  background-color: whitesmoke;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.line {
  fill: none;
  stroke: steelblue;
  stroke-width: 1.5px;
}

p {
  font-size: 12px;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
var translate = function(x, y) { return "translate(" + x + "," + y + ")"; };

var margin = {top: 20, right: 80, bottom: 30, left: 50},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var dateFormat = d3.time.format("%x");

var x = d3.time.scale()
    .range([0, width]);

var y = d3.scale.linear()
    .range([height, 0]);

var color = d3.scale.category10();

var xAxis = d3.svg.axis()
    .scale(x)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .orient("left");

var line = d3.svg.line()
    .interpolate("linear")
    .x(function(d) { return x(new Date(d.key)); })
    .y(function(d) { return y(d.values); });

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", translate(margin.left, margin.top));

d3.csv("sfpd-property-crimes-2005-2015.csv", function(d) {
    var row = {};

row.date  = dateFormat.parse(d["Date"]);
    row.category = d["Category"];
    row.count = +d["Incidents"];

return row;
  },
  function(error, rows) {
    if (error) throw error;

data = d3.nest()
      .key(function(d) { return d.category; })
      .key(function(d) { return d.date;})
      .rollup(function(values) {
        return d3.sum(values, function(d) {
          return d.count;
        })
      })
      .entries(rows);

var crimes = data.keys();
    color.domain(crimes);

var min = 100, max = 1;

data.forEach(function(d) {
      d.values.forEach(function(c) {

if (c.values > max) {
          max = c.values;
        } else if (c.values < min) {
          min = c.values;
        }

});
    });

//     console.table(rows);
//     console.table(data);

x.domain(d3.extent(rows, function(d) { return d.date; }));
    y.domain([min, max]);

svg.append("g")
        .attr("class", "x axis")
        .attr("transform", translate(0, height))
        .call(xAxis)
        .append("text")
          .attr("x", width - 10)
          .attr("y", 10)
          .attr("dy", ".71em")
          .style("text-anchor", "end")
          .text("Date");

svg.append("g")
        .attr("class", "y axis")
        .call(yAxis)
      .append("text")
        .attr("transform", "rotate(-90)")
        .attr("y", 6)
        .attr("dy", ".71em")
        .style("text-anchor", "end")
        .text("Number of Incidents");

svg.append("text")
        .text("SF Property Crimes from 2005 to 2015")
        .attr("x", 450)
        .attr("y", 20)
        .attr("text-anchor", "middle")
        .attr("font-size", "18px");

var crime = svg.selectAll(".crime")
        .data(data)
        .enter()
        .append("g")
        .attr("class", "crime");

crime.append("path")
        .attr("class", "line")
        .attr("d", function(d) {
          return line(d.values); })
        .style("stroke", function(d) { return color(d.key); });

var legend = svg.selectAll(".legend")
        .data(color.domain().slice().reverse())
      .enter().append("g")
        .attr("class", "legend")
        .attr("transform", function(d, i) { return translate(0, i * 20);
        });

legend.append("rect")
        .attr("x", 130)
        .attr("width", 18)
        .attr("height", 18)
        .style("fill", color);

legend.append("text")
        .attr("x", 120)
        .attr("y", 9)
        .attr("dy", ".35em")
        .style("text-anchor", "end")
        .text(function(d) { return d; });
});
</script>

https://d3js.org/d3.v3.min.js